●Water Filled Dumbbell. Anti- extrusion, anti- burst and anti- odor. ●Water Bottle Dumbbell. You can use it to exercise you arm muscle as a dumbell when full of water or other liquid. ●Water Filled Dumbbell. High strength, hardness and wear resistance. ●Water Bottle Dumbbell. A great gift for your friends and yourself, great for home or accessory for. ●Water Filled Dumbbell. The high- quality materials, the cup body and lid made of plastic. Environmental friendly, safe for your health..